Redness, swelling, itching? Oozing? Not a pleasant set of symptoms, but one you run the risk of experiencing if you're a cellphone user, says the American College of Allergy, Asthma and Immunology (ACAAI).

New research aiming to incorporate the best data from previous studies indicates that cellphones really do increase the risk of brain cancer. Independent studies follow-up over a long period suggest the risk is doublerd for heavy phone users.

San Francisco's Board of Supervisors has voted overwhelmingly in favour of a law requiring retailers to display the amount of radiation emitted by cellphones. It's likely to become law after a ten-day comment period.